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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e96ca54ab59ad4938ecd9db06246e51589b1faeec07f8de5a331ced0355d9c' 
  AND token = '1k32a9OJoIPXhSaVQx1OqzJDOFbAEWuzrgjcyOR+HFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}